diff --git a/ajax/getfoldercontents.php b/ajax/getfoldercontents.php
index 84d94e6..5cac934 100644
--- a/ajax/getfoldercontents.php
+++ b/ajax/getfoldercontents.php
@@ -39,10 +39,9 @@ $fullcompath = COMICSDIR . (($compath == "/") ? "" : $compath) . "/";
 // Build up a list of comics and issues which have been read in descending order by lastupdate
 $query = "SELECT comic, issue FROM pagetracker WHERE username=:username";
 //$query = "SELECT comic, issue FROM pagetracker WHERE username=:username ORDER BY lastupdate DESC";
-$fields = array();
-$fields[":username"] = $_SESSION['username'];
 $sth = $globaldbh->prepare($query);
-$sth->execute($fields);
+$sth->bindValue(":username", $_SESSION['username'], PDO::PARAM_STR);
+$sth->execute();
 $comics_read = array();
 $issues_read = array();
 while ( $row = $sth->fetch(PDO::FETCH_ASSOC) ) {
diff --git a/ajax/setpage.php b/ajax/setpage.php
index dc8956d..06e095c 100644
--- a/ajax/setpage.php
+++ b/ajax/setpage.php
@@ -24,13 +24,12 @@ $page = intval($_REQUEST['page']);
 $query = "INSERT INTO pagetracker (username, comic, issue, currentpage, lastupdate) ";
 $query .= "VALUES(:username, :comic, :issue, :currentpage, NOW()) ";
 $query .= "ON DUPLICATE KEY UPDATE currentpage=:currentpage, lastupdate=NOW()";
-$fields = array();
-$fields[':username'] = $_SESSION['username'];
-$fields[':comic'] = str_replace("/", "", $_SESSION['compath']);
-$fields[':issue'] = $_SESSION['comfile'];
-$fields[':currentpage'] = $page;
 $sth = $globaldbh->prepare($query);
-$sth->execute($fields);
+$sth->bindValue(":username", $_SESSION['username'], PDO::PARAM_STR);
+$sth->bindValue(":comic", str_replace("/", "", $_SESSION['compath']), PDO::PARAM_STR);
+$sth->bindValue(":issue", $_SESSION['comfile'], PDO::PARAM_STR);
+$sth->bindValue(":currentpage", $page, PDO::PARAM_INT);
+$sth->execute();
 
 $data['message'] = "Page set to $page for {$_SESSION['username']} reading {$_SESSION['comfile']}";
 
diff --git a/ajax/showcomic.php b/ajax/showcomic.php
index 30d8ec6..26aea1a 100644
--- a/ajax/showcomic.php
+++ b/ajax/showcomic.php
@@ -35,11 +35,10 @@ $_SESSION['comfile'] = basename($comicfull);
 
 // Get the current page for this comic or 0 (zero) if never opened
 $query = "SELECT currentpage FROM pagetracker WHERE username=:username AND issue=:issue";
-$fields = array();
-$fields[':username'] = $_SESSION['username'];
-$fields[':issue'] = $_SESSION['comfile'];
 $sth = $globaldbh->prepare($query);
-$sth->execute($fields);
+$sth->bindValue(":username", $_SESSION['username'], PDO::PARAM_STR);
+$sth->bindValue(":issue", $_SESSION['comfile'], PDO::PARAM_STR);
+$sth->execute();
 if ( $row = $sth->fetch(PDO::FETCH_ASSOC) ) {
    $currentpage = intval($row['currentpage']);
 } else {